Answer: it will take 0.5 year for these trees to be the same height.
Step-by-step explanation:
Let x represent the number of years it will take for these trees to be the same height.
Type A is 3 feet tall and grows at a rate of 23 inches per year. It means that the height of Type A after x years is
23x + 3
Type B is 6 feet tall and grows at a rate of 17 inches per year. It means that the height of Type B after x years is
17x + 6
For the height of both trees to be the same, the number of years would be
23x + 3 = 17x + 6
23x - 17x = 6 - 3
6x = 3
x = 3/6
x = 0.5